Do the shader lights cast shadows?

I really like the look of renders done with the shader lights (light presets/DS Default) but I swear I am not seeing any of them cast either kind of shadow. And since someone was nice enough to add them it would be super if they were fully useful.

And on a similar note. Why does saving a light not give you the option to not have it over ride the other lights in the scene? The shader lights do that and newly created light presets do it. I've been saving them as a scene subset..but it makes the save as a light preset less than handy. I can see times when you would want lights to remove the old lights but it isn't logical that it is the only save option. I think holding down control prevents the over ride but it doesn't give the pop up option window to choose. And to be honest not everyone knows to try that trick.

You've got me mystified, guys. Which shader lights are you talking about? If it's shader mixer lights, they do cast shadows for me... At least they did in DS3... Now you've spooked me, I fired up DS4,set up a boring test scene and created a distant light and a spot light in the shader mixer. Both lights cast both DSM and raytraced shadows just fine.
Area lights also cast shadows just fine in DS4, at least those from IG's Photo Studio LE freebie.

I don't recall them from studio 4 but in studio 4 if you go to light presets there are a set of shader lights. Spot, distance and point and while they tend to do wonderful things for skin textures they are a bit tricky to deal with. No shadows and they overwrite lights you already have saved in the scene. I've re saved them as scene assets to use them myself.

Those look a lot like the ones that used to be part of the Script Dev Kit in DS2 & 3. if they are then I don't think they were ever meant for general use, more as examples for people learning to write script.

Guys, I've figured out what's wrong with the shadows, it's delightfully easy to fix. Unfortunately I don't understand where exactly the when-added-to-scene behaviour is located, so we'll have to deal with the Ctrl-click.

One of the things I like about them, even more with shadows, is that they are fast...one of the fastest raytraced lights in the tool kit...because they are more or less 'standard' rsl lights.

Ctl-click brings up the dialog box allowing you to replace all, replace selected or add...I know there's a way to adjust the script to do that automatically...maybe I'll get a chance to look into that a bit later (I think it will be another simple edit)...

I know it should be a simple matter to make them pop up the dialog box instead of having to hold down the ctl key...but for the some reason I'm not seeing it. The default choice is set to 'replace'...which should probably be set to 'ask'...or at least 'add'.